x1, y1, x2, y2 = map(float,input().split())
print(f'{((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5:8f}') x1, y1, x2, y2 = map(float,input().split()) x1 map(float,input().split()) map float input().split() ().split () input split y1 x2 y2 print(f'{((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5:8f}') print f'{((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5:8f}' x1, y1, x2, y2 = map(float,input().split()) map(float,input().split()) x1 y1, x2, y2 = map(float,input().split()) map(float,input().split()) y1 x2, y2 = map(float,input().split()) map(float,input().split()) x2 y2 = map(float,input().split()) map(float,input().split()) y2
x1, y1, x2, y2 = map(float,input().split())
print(f'{((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5:8f}')
